Pressure Control Repair - Graco GMax 233700 Instruction & Repair Manual

Digital Display Messages
Relieve pressure before repair; page 5. No display does not mean that sprayer is not pressurized.
DISPLAY
No Display Sprayer may be pressurized.
Sprayer may be pressurized.
Sprayer is pressurized. Power is ap-
psi
plied. (Pressure varies with tip size and
bar
pressure control setting.)
MPa
Sprayer stops. Engine is running.
Sprayer stops. Engine is running.
Sprayer stops. Engine is running.
Sprayer stops. Engine is running.
Display alternates E=06.
Sprayer stops. Engine is running.
After a fault, follow these steps to restart sprayer:
1. Correct fault condition
2. Turn sprayer OFF
3. Turn sprayer ON
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Pressure Control Repair

SPRAYER
OPERATION
INDICATION
Loss of power or display
not connected
Pressure less than
200 psi (14 bar, 1.4 MPa)
Normal operation
Exceeded pressure limit
Pressure transducer faulty,
bad connection or broken
wire.
High clutch current
High clutch temperature
Pressure greater than
2000 psi (138 bar, 14 MPa)
while in Flush Timer Mode
ACTION
Check power source. Relieve
pressure before repair or dis-
assembly. Verify display is
connected.
Increase pressure as needed
Spray
Remove any filter clogs or
flow obstructions. Make sure
gun trigger is locked open if
using AutoClean valve.
Check transducer connections
and wire. Replace transducer
or control board, if necessary.
1. Check clutch 7–pin bulk-
head connector. Clean
contacts.
2. Measure 1.2 ±0.2Ω
(GMax 3900); 1.7 ±0.2Ω
(GMax 5900) across
clutch field at 70_F
3. Replace clutch field as-
sembly
1. If clutch is new, let spray-
er cool down and then re-
start
2. Inspect clutch. Replace
clutch if there is excessive
wear.
3. Remove pump pin, sepa-
rate pinion housing from
clutch housing. Rotate
rotor clockwise to check
for excessive drag.
1. Flush paint from hose be-
fore operating Flush Timer
Mode
2. Verify AutoClean is acti-
vated and gun valve and
prime valve are open